C/2006 M4 (SWAN)
| Parameter |
Value |
| Designation |
C/2006 M4 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-09-28T17:29:02.883840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
1265 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
7.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-11-10.0000000 |
| e |
1.00018505 |
| q (au) |
0.783008 |
| a (au) |
-4231.355299 |
| i (deg) |
111.823262 |
| Ω (om, deg) |
148.726842 |
| ω (w, deg) |
62.594371 |
| M (ma, deg) |
0.000151 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.703 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.703 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:52:48.47 |
-57:28:55.6 |
HIP 107998 |
8.84 |
| 2026-02-03 12:00 |
21:52:53.54 |
-57:28:39.9 |
HIP 107998 |
8.61 |
| 2026-02-04 00:00 |
21:52:58.62 |
-57:28:24.5 |
HIP 107998 |
8.45 |
| 2026-02-04 12:00 |
21:53:03.71 |
-57:28:09.3 |
HIP 107998 |
8.34 |
| 2026-02-05 00:00 |
21:53:08.81 |
-57:27:54.4 |
HIP 107998 |
8.30 |
| 2026-02-05 12:00 |
21:53:13.91 |
-57:27:39.7 |
HIP 107998 |
8.34 |
| 2026-02-06 00:00 |
21:53:19.02 |
-57:27:25.2 |
HIP 107998 |
8.43 |
| 2026-02-06 12:00 |
21:53:24.13 |
-57:27:11.0 |
HIP 107998 |
8.60 |
| 2026-02-07 00:00 |
21:53:29.25 |
-57:26:57.0 |
HIP 107998 |
8.82 |
| 2026-02-07 12:00 |
21:53:34.38 |
-57:26:43.3 |
HIP 107998 |
9.10 |
| 2026-02-08 00:00 |
21:53:39.51 |
-57:26:29.8 |
HIP 107998 |
9.43 |
| 2026-02-08 12:00 |
21:53:44.65 |
-57:26:16.6 |
HIP 107998 |
9.81 |
| 2026-02-09 00:00 |
21:53:49.79 |
-57:26:03.6 |
HIP 107998 |
10.23 |
| 2026-02-09 12:00 |
21:53:54.93 |
-57:25:50.8 |
HIP 107998 |
10.69 |
| 2026-02-10 00:00 |
21:54:00.08 |
-57:25:38.3 |
HIP 107998 |
11.17 |
| 2026-02-10 12:00 |
21:54:05.23 |
-57:25:26.1 |
HIP 107998 |
11.68 |
| 2026-02-11 00:00 |
21:54:10.39 |
-57:25:14.1 |
HIP 107998 |
12.22 |
| 2026-02-11 12:00 |
21:54:15.54 |
-57:25:02.3 |
HIP 107998 |
12.78 |
| 2026-02-12 00:00 |
21:54:20.70 |
-57:24:50.8 |
HIP 107998 |
13.35 |
| 2026-02-12 12:00 |
21:54:25.86 |
-57:24:39.6 |
HIP 107998 |
13.94 |
| 2026-02-13 00:00 |
21:54:31.03 |
-57:24:28.6 |
HIP 107998 |
14.54 |
| 2026-02-13 12:00 |
21:54:36.19 |
-57:24:17.8 |
HIP 107998 |
15.16 |
| 2026-02-14 00:00 |
21:54:41.36 |
-57:24:07.3 |
HIP 107998 |
15.78 |
| 2026-02-14 12:00 |
21:54:46.52 |
-57:23:57.1 |
HIP 107998 |
16.42 |
| 2026-02-15 00:00 |
21:54:51.69 |
-57:23:47.2 |
HIP 107998 |
17.06 |
| 2026-02-15 12:00 |
21:54:56.85 |
-57:23:37.5 |
HIP 107998 |
17.71 |
| 2026-02-16 00:00 |
21:55:02.02 |
-57:23:28.0 |
HIP 107998 |
18.36 |
| 2026-02-16 12:00 |
21:55:07.18 |
-57:23:18.8 |
HIP 107998 |
19.02 |
| 2026-02-17 00:00 |
21:55:12.35 |
-57:23:09.9 |
HIP 107998 |
19.68 |
| 2026-02-17 12:00 |
21:55:17.51 |
-57:23:01.2 |
HIP 107998 |
20.35 |
| 2026-02-18 00:00 |
21:55:22.67 |
-57:22:52.9 |
HIP 107998 |
21.02 |
| 2026-02-18 12:00 |
21:55:27.82 |
-57:22:44.7 |
HIP 107998 |
21.69 |
| 2026-02-19 00:00 |
21:55:32.98 |
-57:22:36.9 |
HIP 107998 |
22.37 |
| 2026-02-19 12:00 |
21:55:38.13 |
-57:22:29.3 |
HIP 107998 |
23.05 |
| 2026-02-20 00:00 |
21:55:43.28 |
-57:22:21.9 |
HIP 107998 |
23.73 |
| 2026-02-20 12:00 |
21:55:48.42 |
-57:22:14.9 |
HIP 108472 |
23.37 |
| 2026-02-21 00:00 |
21:55:53.56 |
-57:22:08.1 |
HIP 108472 |
22.78 |
| 2026-02-21 12:00 |
21:55:58.69 |
-57:22:01.5 |
HIP 108472 |
22.20 |
| 2026-02-22 00:00 |
21:56:03.82 |
-57:21:55.3 |
HIP 108472 |
21.63 |
| 2026-02-22 12:00 |
21:56:08.94 |
-57:21:49.3 |
HIP 108472 |
21.06 |
| 2026-02-23 00:00 |
21:56:14.06 |
-57:21:43.5 |
HIP 108472 |
20.50 |
| 2026-02-23 12:00 |
21:56:19.18 |
-57:21:38.1 |
HIP 108472 |
19.95 |
| 2026-02-24 00:00 |
21:56:24.28 |
-57:21:32.9 |
HIP 108472 |
19.40 |